Feed apparatus for automatic lathe
OwnerPhilippe Scheurerinventor
Life of this patent
Estimating the term…
Abstract
A bar stock feeding apparatus for an automatic lathe, comprising a tube for guiding the bar stock. A piston is situated in the tube behind the bar stock for pushing it towards the headstock of the lathe, the piston itself being urged towards the headstock by means of oil pressure while part of the oil overtakes the piston by flowing through a clearance left between the piston and the inner wall of the tube and through an inner channel through the piston having an adjustable cross-section. Regulating means and non-return valve means are provided in the inner channel for rendering the piston retractable responsive to oil underpressure applied instead of the oil pressure.
Claims11
A feed apparatus for an automatic lathe having a headstock equipped with a collet opening at the end of each working cycle of said lathe, comprising:
- at least one tube arranged for being disposed in alignment with said headstock for guiding a piece of bar stock engaged in said headstock, the front end of said tube being near said headstock and the rear end of said tube being remote from said headstock,
- means for exerting pressure upon said bar stock for preventing it from remaining axially integral with said collet when said collet opens,
- wherein said means for exerting pressure comprise:
- a piston engaged with clearance in said tube, said clearance forming a passage bypassing said piston,
- means provided on said piston for pushing said bar stock towards said headstock responsive to a movement of said piston towards said headstock, and
- a hydraulic arrangement adapted for supplying oil under pressure at said rear end of said tube and thereby urging said piston with said bar stock towards said headstock, said piston including:
- an inner channel having an adjustable cross-section and being operatively parallel to said passage formed by said clearance, and
- regulating means in said inner channel for adjusting said cross-section of said inner channel, wherein said oil supplied under pressure by said hydraulic arrangement passes by said piston with loss of pressure through said passage and through said inner channel in an amount determined by said regulating means.
Dependencies are inferred from the claim text.